The film is one of the most talked-about entries in this year's Venice Film Festival, and one of the top contenders for its top prize, the Golden Lion.

Shot in more than 40 refugee camps across 23 countries, the documentary offers a fresh look at the refugee crisis from Europe to Africa, peppered with poetry, heartbreaking stories and dramatic aerial footage.

"Human Flow" is one of the films tipped for the Golden Lion prize at Venice Film Festival [Pascal Le Segretain/Getty Images]

Speaking at the festival, Ai said a solution to the crisis could easily reached once people realise that the refugee problem is "about all of us".

"It takes individuals to act, to be involved, to push the politicians, to create the right discussion," he said.

As many as 70 countries have placed walls to stem the flow of refugees. In an interview with the Huffington WorldPost, Ai artist said that he plans to screen his documentary to legislators involved in the refugee policies.

"My art is a personal effort to help viewers understand, through experiences and emotions, another person or another condition," he said.

Lee Marshall, a critic for Screen Daily, said he was impressed by the way Ai had approached his role in the film.

"One nice thing about it, for me, is that he does appear in the film but very much as a guy who is just hanging out with refugees," Marshall told Al Jazeera, "rather than going in ... and being very pushy and trying through irony or provocation to get his agenda through".

A major artist of our times, Ai is renowned for his activism [Alessandro Bianchi/Reuters]